The song is a riddle. Most people do not realize it is a Christian song at first but if they listen to the words closely they will discover it is about the power of love and faith and how we must care for each other and as a result we will be together forever in a much better place.
Walkin refers to Walking toward the light as you pass away. Louisiana is the singer's best friend who she is asking for help. " Out of the water" is a reference to the singer's baptism.